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- TTL在ping命令中代表什么？ - 知乎
TTL（Time-to-Live）实际上是一个8比特的字段，在每个IP数据包的头部信息中都有这个字段。 TTL的主要作用是防止数据包在网络中无限制地传输或循环。
- How does TTL serial work? - Electrical Engineering Stack Exchange
I've been trying to find a good description of the TTL serial "standard" without much luck I understand that serial transmit (TX) and receive (RX) lines idle high (at VCC) and that they drop to g
- 带你一分钟了解编码器基础知识 - 知乎
此外，增量编码器的信号输出电平标准也是多样的，常见的有TTL、HTL、PNP和NPN等。 TTL和HTL是常见的电平标准，其中TTL为长线差分驱动，而HTL也称为推拉式或推挽式输出，适用于工业控制系统。 PNP和NPN则是集电极开路输出的两种类型，用于不同的电路连接需求。
- digital logic - What is meant by TTL in this context? - Electrical . . .
TTL requires that logic 1 input must be at least 2V, and TTL drivers are designed to guarantee that That is far short of what this driver requires to register as logic 1
- 当TTL等于1时经过的最大路由个数为0，当TTL等于255时，能经过的路由器个数为255，为什么? - 知乎
因为每经过一个路由器路由器会将ttl减1后发给下一跳，当ttl等于0路由器会丢弃该IP包。 所以ttl等于1时，路由器收到该包，减1，为0丢弃。
- serial - How to read inverted uart signal - Electrical Engineering . . .
Placing an invertor in-line will change tje signal to what normal TTL level UART receiver expects History lesson: The reason for idle level being H is to detect that the signalling circuit is intact The UART (asynchronous receiver) technology has its roots in teletype communication
- How does this RS485 Module work? - Electrical Engineering Stack Exchange
I am planning to use this UART-to-RS485 module This module is bidirectional and uses a single pair of differential signal to transmit receive data My question is how does the chip decide whether
- USART, UART, RS232, USB, SPI, I2C, TTL, etc. what are all of these and . . .
TTL mean Transistor-Transistor-Logic and has its level for logical zero near 0V and for logical one near 5V Often any 5V logic is called TTL, although most circuits nowadays are built as CMOS Today there are also many circuits that work at 3 3V, which is no longer TTL
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